We recommend a front-loading washer (or a top loader without an agitator). Secure the pad tubes with a thick rubber band, rope, etc. Wash with cold water on a delicate cycle.
To dry the pad, keep the pad tubes secured and dry on a delicate cycle with no heat. Do not bleach, do not iron, and do not dry-clean the pad.
Make sure the pad is completely dry before reconnecting to a power source.